On 11/28/2016 05:25 AM, Allan W. Nielsen wrote: > From: Raju Lakkaraju <raju.lakkar...@microsemi.com> > > Add loopback in ethtool tunables to access PHY drivers. > > Ethtool Help: ethtool -h for PHY tunables > ethtool --set-phy-tunable DEVNAME Set PHY tunable > [ loopback off|near|far|extn ] > ethtool --get-phy-tunable DEVNAME Get PHY tunable > [ loopback ] > > Ethtool ex: > ethtool --set-phy-tunable eth0 loopback near > ethtool --set-phy-tunable eth0 loopback far > ethtool --set-phy-tunable eth0 loopback extn > ethtool --set-phy-tunable eth0 loopback off > > ethtool --get-phy-tunable eth0 loopback > > Signed-off-by: Raju Lakkaraju <raju.lakkar...@microsemi.com> > Signed-off-by: Allan W. Nielsen <allan.niel...@microsemi.com> > ---
> +Near-End Loopback: > +Transmitted data (TXD) is looped back in the PCS block onto the receive data > +signal (RXD). When Near-End loopback enable, no data is transmitted over > +the network. no data receive from the network. This is also known as the local loopback test mode, right? > + > +Far-End Loopback: > +This loopback is a special test mode to allow testing the PHY from link > +partner side. In this mode data that is received from the link partner pass > +through the PHY's receiver, looped back on the MII and transmitted back to > +the link partner. And this is the remote loopback mode. > + > +External Loopback: > +An RJ45 loopback cable can be used to route the transmit signals an the > +output of the trnsformer back to the receiver inputs and this loopback will > +work at either 10 or 100 or 1000 Mbps speed. > +RJ45 Loopback cable created by conncting pin 1 to pin 3 and connecting pin > +2 to pin 6. OK, this name makes sense to me, but for the two other names, we need to use a terminology that is clearer to the reader and/or people familiar and targeted at using this feature (e.g: in a lab or during manufacturing). -- Florian
